Well due to things happening we didn't get around to this, but let me just say that the Right to Conscription by a Grey Warden means they can take anyone who is willing to join them no matter their other obligations, incarcerations or other such circumstances.

So if a Grey Warden thought that Mordrid a convicted murderer who was sentenced to death would be someone that the Grey Wardens could use then they can take them and the sentence is put aside. Or if they want to enlist a Knight who is in the service of a Baron, they can.